NWC203c Questions and Answers 2024
1. Suppose datagrams are limited to 1500 bytes including IP header of 20 bytes. UDP header is 8 bytes. How many datagrams would be required to send an MP3 of 50000 bytes
32
33
34
35: 34
2. As soon as the browser receive the IP address from , it can initiat...
1. Suppose datagrams are limited to 1500 bytes including IP header of 20 bytes. UDP header is 8 bytes. How
many datagrams would be required to send an MP3 of 50000 bytes
32
33
34
35: 34
2. As soon as the browser receive the IP address from , it can initiate a TCP
connection to the HTTP server located at port at that IP
FTP...20
Client..60 User...80
DNS...80: DNS...80
3. SMTP, POP3,, and IMAP protocols run on the following layer: Transport layer
Network layer Link layer
None of them: None of them
4. In computer networking, hosts are sometimes divided into two categories: Network and routers
Clients and servers
End-system and beginning-system Roters and clients:
Clients and servers
5. Two types of network switching are:
X25 and Frame Relay ATM and
Frame Relay Circuit and Packet
Datagram and X25: Circuit adn Packet
6. Which delay mainly depends on the congestion of the network? Queuing delay
Transmission delay Processing
delay
Propagation delay: Queuing delay
7. What is the order of the 5 layers in the internet model? Application, transport,
network, link, physical Application, network, lnik, physical, transport Application,
transport, link, physical, network
Application, transport, network, physical, link: Application, transport, network, link, physical
, NWC203c Questions and Answers 2024
8. Vulnerability Attack Bandwidth Flooding and Connection Flooding belongs to
Bogus Attack
Sniffer Snooding
Internet DoS Attack: Internet DoS Attack
9. A packet of L bits is transmitted via the link with the transmission rate of R bits/sec; the transmission delay is
L/R
R/L
2L/R
2R/L: L/R
10.Assume that an image is about 1000 x 800 pixels with 3 bytes/pixel and it is uncompressed. How long does it
take to transmit it over a 1 Mbps channel?
!9.2 sec
24 sec
2.4 sec
1.12 sec: 19.2 sec
11. There are 4 serial links between the client and the server, with the transmis- sion rates being 3Mbps, 12
Mbps, 12Mbps, and 2Mbps. What is the throughput between the client and the server?
2 Mbps
1 Mbps
3 Mbps
12 Mbps: 2 Mbps
12.If the router's buffer memory is empty and no other packet is currently being transmitted, then the
packet's will be zero
Transmission delay Queuing
delay Propagation delay
Processing delay: Queuing delay
13.In the file distribution of the client-server model, the server has to send
of file to many hosts, consuming (tiêu thå) a large amount of
Copies...bandwidth
Copies...transmission Duplicate
...bandwidth
Portion...transmission: Copies...bandwidth
14.Although HTTP is stateless (không tr¡ng thái), if the webserver wants to identify the users, is used
, NWC203c Questions and Answers 2024
Cookies Caches
Password ID:
Cookies
15.When you use ftp client (a utility in Windows), what is command used to get files from ftp server?
get retr
recv ls:
get
16.This command identifies the receiver of the message in email DATA
HELLO MAIL
FROM
RCPT TO: RCPT TO
17.Regarding to the DNS, hostnames such as www.fpt.edu.vn, www.stan- ford.edu are to remember by
human, but to process by routers Easy..Clear
Easy...Difficult
Difficult...Easy
Difficult...Heavy: Easy...Difficult
18.DNS is hort for Distributed Name
System Distributed Network System
Distributed Network Simplification
Domain Name System: Domain Name System
19.Shype is a Kazza
application Network
application
Transport application
P2P application: P2P application
20.Assume the one-way propagation delay 100ms, the size of the Web object 0.2Mb and the transmission rate
10Mbps, how long does it take to dowload that object from a Web Server to a client if using non-presistent
HTTP? 420ms
220ms
440ms
240ms: 420ms
, NWC203c Questions and Answers 2024
21.The job of delivering the data in a transport-layer segment to the correct application process is called
De-multiplexing
Multiplexing Congrstion
control
Gathering: De-multiplexing
22.Which protocol is better for real-time video application over the Internet in term of minimizing the average
transmission delay?
UDP
TCP
ICMP
ARP: UDP
23.Which the following is the individual characteristic of redt3.0? Packet retransmission on
receipt of NAK
Requires countdown timer Handling
duplicate packets
Retransmit current packet on receipt of duplicate ACK Sequence number added to
packet: Requires countdown timer
24.The acknowledgment number in TCP segment is .
Cumulative
Randomly Generated
Independent
0: Cumulative
25.What is the one's compliment 8-bit checksum of the following 8-bit binary numbers:
1001 0101 and 1010 1010
1011 1111
0100 0000
0011 1111
1010 1110: 1011 1111
26.Hold A and B are communicating over a TCP connection, host A send to host B the first segment with size
5105 bytes, sequence number 600, the source port 1028, the destination port 1029. What is the ACK number,
the
source port number, the destination port number in the ACK segment in the ACK segment sent by host B to host
ACK number: 5705, source port: 1028, destination: 1029
ACK number: 5700, source port: 1029,
destination: 1028
ACK number: 5706, source port: 1028, destination: 1029
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